Introduction: Mastoid is the most frequent complication of media otitis. Streptococcus pneumoniae is the most common microorganism. It presents with fever, hyperemia, and retroauricular edema; ear protrusion with disappearance of the retroauricular sulcus; and otorrhea. Clinical diagnosis is associated with imaging examination. Complete blood count shows leukocytosis. Treatment is carried out with intravenous antibiotics and drainage of the abscess, while simple mastoidectomy is being discussed by some authors.